“04. What's heavier - a ton of feathers or a ton of rocks? The juxtaposition of the weightless feather painted on a heavy stone makes this idea really fun.…” ROCK ART! Painting on Rocks, Stones and pebbles - by Denise Scicluna http://www.amazon.co.uk/Rock-Art-Painting-Crafting-Humble/dp/1438005326